JP2013167347A - Fastening device using insert screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening device using an insert screw, capable of fastening surely a relatively flexible member to another member, and capable of carrying out accurate centering for the insert screw and a bolt.SOLUTION: A fastening device using an insert screw includes: an insert screw 1 comprising a cylindrical member formed vertically with a through-hole, and formed with screw parts having thread cutting directions opposite to each other on an outer circumferential face and an inner circumferential face; and a bolt 6 insertable into the insert screw 1, wherein: the insert screw 1 is formed with a flange 10 in one outer circumferential end part; the flange 10 is formed with a flat plane part 10a in its head part, and is formed with a tapered conical part 10b spread toward the head part on a bearing surface; an opening angle of the conical part of the bearing surface is formed to be an opening angle defined in the Standard of a flat countersunk head screw; and a hexagon hole 10c engageable with a hexagon wrench is formed with a fixed depth, in a through-hole opening part in the head part of the flange.

Description

  The present invention relates to a fastening device using an insert screw used when fastening a soft member such as aluminum or resin and another member made of iron or the like.

  Conventionally, in the process of molding automobile parts and the like, a base is formed by fastening a relatively soft first member made of aluminum and a hard second member made of iron or the like with bolts on the base. Various parts may be molded.

  As a fastening device for such a member, in order to reinforce the female screw provided on the relatively soft first member, a linear member having a diamond-shaped cross section is processed into a spiral shape to form an insert coil. A device for fastening the first and second members by screwing into a female screw of a first member and screwing the bolt into the insert coil of the second member via the hard second member is proposed. (Patent Document 1).

  Also, a cylindrical reinforcing insert screw having a female screw formed inside and a male screw formed outside is screwed into the screw hole of the relatively soft first member, and the first member is inserted through the second member. An apparatus for fastening the first and second members by screwing a bolt into the reinforcing insert screw has been proposed (Patent Document 2).

JP 2008-38937 A JP 7-174123 A

  By the way, the fastening and releasing of the first member and the second member are repeated depending on the type or size of the part to be molded in the process of molding the part. When the attachment / detachment is repeatedly performed, the insert coil may be detached from the female screw of the first member, and there is a problem that the replacement of the insert coil is frequently required.

  Further, in the reinforcing insert screw of Patent Document 2, it is difficult to center the center axis of the reinforcing insert screw and the center axis of the bolt (center axis alignment). When the attachment and detachment of the member and the second member are repeated, there is a problem that the center axis is displaced and it is difficult to fasten the two members at an accurate position.

  The present invention has been made in view of the above-described conventional problems, and can insert a relatively soft member and another member reliably and can accurately center the insert screw and the bolt. An object of the present invention is to provide a fastening device using the sword.

In order to achieve the above object, the present invention
First, an insert screw comprising a cylindrical member having a through-hole formed in the vertical direction and having an outer peripheral surface and an inner peripheral surface formed with screw portions whose threading directions are opposite to each other, and screwing into the insert screw The insert screw has a flange formed on one outer peripheral end thereof, and the flange has a flat flat surface formed on the head, and a seating surface facing the head. A tapered conical portion is formed, the opening angle of the conical portion of the seating surface is an opening angle defined by a countersunk screw standard, and a hexagon wrench is formed in the through hole opening on the head side of the flange. Is formed by a fastening device using an insert screw, wherein hexagonal holes that can be fitted are formed at a certain depth.

  The flat screw standard, which is the opening angle of the conical portion, is 90 degrees, for example. The threaded portions whose threading directions are opposite to each other on the outer peripheral surface and the inner peripheral surface are, for example, the male screw (3) and the female screw (4) of the insert screw (1). If comprised in this way, the conical counterbored hole which has a through-hole and a cone part with an opening angle of 90 degree | times will be processed and formed in the 1st member, for example by the sunk milling machine (12) for countersunk machine screws, Then, the above-mentioned A screw hole into which the insert screw 1 can be screwed can be formed by raising a tap in the through hole. Thereafter, by inserting an insert screw into the screw hole of the first member, the conical portion of the flange of the insert screw and the conical portion of the screw hole are joined, whereby the insert screw and the screw hole of the first member are joined. Centering can be performed. After that, the second member is joined to the first member, and the screw portion (female screw (4) on the inner peripheral surface of the insert screw in which the bolt is screwed into the first member through the bolt insertion through hole of the second member. )), The first member and the second member can be fastened.

  2ndly, it is a fastening device using the insert screw of said 1st, Comprising: The 1st member by which the screw hole which the screw part of the outer peripheral part of the said insert screw can be screwed through was formed, and the said 1st member And a second member formed with a bolt insertion through hole that can communicate with the screw hole, the insert screw is screwed into the screw hole of the first member, and the first member and the second member are screwed together. The first member and the second member are engaged with each other by screwing the bolt into a screw portion of the inner peripheral portion of the insert screw through the bolt insertion through hole of the second member in a state where the member is joined. And a conical portion having a conical portion joined to the conical portion of the seating surface of the flange at a corresponding position of the flange of the insert screw in the screw hole of the first member. Counterbore hole formed It is intended that constituted by the fastening apparatus using the insert screw and said.

  Accordingly, when the insert screw is screwed into the screw hole of the first member, the conical portion of the flange of the insert screw and the conical portion of the counterbore hole of the screw hole of the first member are joined, thereby the insert screw. And the screw hole of the first member can be centered. Accordingly, when the bolt is screwed into the insert screw of the first member through the bolt insertion through hole of the second member, the central axis of the bolt and the central axis of the female screw of the insert screw are made to coincide with each other. Thus, the first member and the second member can be firmly fastened by suppressing the rattling of the bolt.

  Third, the angle of inclination of the conical portion of the counterbore hole of the first member is formed to be the same as the angle of inclination of the tapered drill portion of the submerged milling cutter for countersunk screws. It is comprised by the fastening apparatus using the insert screw of the said 2nd.

  If comprised in this way, the conical part of the counterbore hole of the screw hole of the 1st member can be easily processed with the sunk mill with a drill for countersunk screws.

  In the present invention, as described above, an insert screw is screwed into a relatively soft first member, and a bolt is screwed into the first member and a second member through a bolt insertion through hole of the second member. The member can be firmly fastened.

  Further, by forming a conical counterbore hole having a conical portion in the screw hole of the first member and joining the conical portion of the flange of the insert screw and the conical portion of the screw hole, the insert screw and the first screw The screw hole of the member can be centered. Therefore, by screwing the bolt into the insert screw, the center axis of the bolt and the center axis of the threaded portion of the inner peripheral surface of the insert screw can be made to coincide with each other. The member and the second member can be firmly fastened.

  In addition, since the screw holes of the insert screw and the first member are centered, even if the bolt is repeatedly screwed in and out of the insert screw, the displacement of the center axis between the insert screw and the bolt is suppressed, and both members The fastening strength can be maintained.

  Further, the conical portion of the counterbore hole of the screw hole of the first member can be easily processed with a sinking mill with a drill for countersunk screws.

It is an exploded sectional view of a fastening device using an insert screw concerning the present invention. It is sectional drawing of the fastening state of a fastening apparatus same as the above. (A) is a front view of the insert screw in the same fastening device, (b) is a side view of the insert screw in the same fastening device. It is a side view of a sunk milling machine with a drill for countersunk screws. (A) is sectional drawing of a 1st member, (b) is sectional drawing which shows the processing state of a 1st member, (c) is sectional drawing which shows the state after the process of a 1st member. (A) is an enlarged front view of the insert screw of FIG. 3 (a), (b) is an enlarged side view of the vicinity of the flange of the insert screw in FIG. 3 (b).

Hereinafter, the fastening device using the insert screw in the present invention will be described in detail.
FIG. 1 is an exploded cross-sectional view of a fastening device according to the present invention. In the figure, reference numeral 1 denotes an insert screw according to the present invention, which is composed of a cylindrical member in which a through hole 2 is formed in the vertical direction, and a threaded portion whose threading directions are opposite to each other on the outer peripheral surface 3a and the inner peripheral surface 4a (A male screw 3 on the outer periphery and a female screw 4 on the inner periphery) are formed. The insert screw 1 is formed of a general screw material such as steel or stainless steel.

  When the insert screw 1 is screwed into the screw hole (female screw) 7 of the first member 5, the male screw 3 of the insert screw 1 rotates the insert screw 1 leftward in the screwing direction. Is formed as a “left screw” that can be screwed into the screw hole 7, and the female screw 4 rotates the bolt 6 in the right direction toward the screwing direction. It is formed as a “right screw” that can be screwed into the female screw 4 of the insert screw 1.

  Accordingly, when the bolt 6 is screwed into the female screw 4 of the insert screw 1 screwed into the screw hole 7 of the first member 5, the rotation direction of the bolt 6 and the screwing direction of the insert screw 1 are Therefore, the insert screw 1 is not loosened in the screw hole 7 of the first member 5 by screwing the bolt 6 into the insert screw 1.

  Reference numeral 6 denotes a bolt that can be screwed into the female screw 4 of the insert screw 1. The insert screw 1 is inserted into the bolt insertion through hole 9 of the second member 8 and screwed into the first member 5. The first member 5 and the second member 8 are fastened by being screwed into the female screw 4. The bolt 6 is also formed of a general bolt material such as steel or stainless steel.

  The insert screw 1 is integrally formed with a flange 10 protruding radially at one outer peripheral end. The flange 10 has a flat plane portion 10a formed on the head on one end side, and a tapered conical portion 10b extending toward the head on the seating surface on the other end side. As a head of a countersunk screw.

  As shown in FIG. 3B, the opening angle of the tapered surface of the conical portion 10b of the flange 10 is 90 degrees, which is the opening angle of the countersunk screw standard, and the flange diameter φ is the countersunk screw standard. For example, it is formed to 24 mm. The male screw 3 of the insert screw 1 is formed as a “left screw” of M16P2.0, for example, and the female screw 4 is formed as a “right screw” of M10P1.5.

  The said 1st member 5 is what the said insert screw 1 is screwed together, for example, is comprised from comparatively soft members, such as aluminum and resin. The first member 5 is used, for example, as a base for processing automobile parts and the like. The overall shape of the first member 5 is, for example, an arc shape, and the screw holes 7 are continuous at regular intervals in the length direction. Is formed. In FIGS. 1 and 2, only the portion where the two screw holes 7 are continuous is shown.

  The first member 5 is formed with a screw hole 7 through which the male screw (screw portion) 3 on the outer peripheral portion of the insert screw 1 can be screwed. In addition, the inclination angle is adjusted so that the flange 10 of the insert screw 1 in the screw hole 7 of the first member 5 can be joined to the conical portion 10b on the seating surface of the flange 10. A counterbore 11 having a conical cone portion 11a is formed.

  The inclination angle of the conical part 11a of the counterbore hole 11 is formed to be the same as 90 degrees which is the inclination angle of the tapered drill part 12a of the existing countersunk screw 12 for a countersunk machine screw 12 shown in FIG. That is, in order to form the screw hole 7 of the first member 5, as shown in FIG. 5, the through hole 13 is formed in the first member 5 by the submerged milling cutter 12 (FIG. 5 (a). (B)), a counterbore hole 11 having a conical portion 11a having a diameter of φ = 24 mm and an opening angle of 90 degrees is formed by machining at the starting end portion of the through-hole 13 by the tapered drill portion 12a (FIG. 5B). c)). Thereafter, the screw hole 7 can be formed by raising the M16 tap from the start end to the end of the through hole 13. As described above, the screw hole 7 of the first member 5 including the counterbore hole 11 can be easily formed by the existing submerged milling machine 12 with a countersunk machine screw.

  Therefore, when the insert screw 1 is screwed into the screw hole 7, the flange 10 of the insert screw 1 is fitted into the counterbore hole 11, as shown in FIG. Since the inclination angle of the conical portion 11a and the inclination angle of the conical portion 10b of the flange 10 of the insert screw 1 coincide with each other, the conical portions 11a and 10b are in close contact with each other, and the central axis C of the screw hole 7 'And the center axis C of the insert screw 1 can be aligned, that is, the insert screw 1 and the screw hole 7 of the first member 5 can be centered.

  Therefore, after that, when the bolt 6 is screwed into the female screw 4 of the insert screw 1 via the second member 8, the central axis C ″ of the bolt 6 and the central axis C of the female screw 4 of the insert screw 1 In this way, the central axis C of the female screw 4 of the insert screw 1 and the central axis C ′ of the screw hole 7 of the first member 5 coincide with each other, and Since the center axis C of the female screw 4 of the insert screw and the center axis C ″ of the bolt 6 can be aligned, the center axes C ″ and C of the bolt 6 and the insert screw 1 are accurately centered, As a result, rattling of the bolt 6 in the direction intersecting the central axis C ″ of the bolt 6 (directions of arrows A and A ′ in FIG. 2) is suppressed, and the first member 5 and the second member 8 are connected. It can be firmly fastened.

  The second member 8 is made of a hard material such as iron or steel, and is fastened to the first member 5 while being placed on the first member 5. The second member 8 has, for example, an arc shape similar to the first member 5 and has a function of positioning the automobile part to be molded at a predetermined position. Therefore, the second member 8 of various sizes is prepared according to the type or size of the automobile part to be molded, and the second member 8 is prepared according to the type or size of the automobile part to be molded. , Which is used frequently.

  The second member 8 is formed with a bolt insertion through hole 9 that can communicate with the screw hole 7 (the female screw 4 of the insert screw 1) of the first member 5.

  Therefore, in the state where the insert screw 1 is screwed into the screw hole 7 of the first member 5 and the first member 5 and the second member 8 are joined, the bolt 6 is connected to the second member 8. The first member 5 and the second member 8 can be fastened by screwing into the threaded portion (female screw 4) of the inner peripheral portion of the insert screw 1 through the through hole 9.

  A hexagonal hole 10c into which a hexagonal wrench can be fitted is formed at a constant depth t in the through hole opening on the head side of the flange 10 of the insert screw 1 (FIGS. 3A and 3B). FIG. 6 (a) (b)). The female screw 4 of the insert screw 1 can be formed, for example, by erecting a tap from the opening to the other end opening in the central through hole of the insert screw 1. After the female screw 4 is formed, the inner peripheral surface of the opening of the female screw 4 is formed into a hexagonal shape over a certain depth t. The hexagonal hole 10c is formed with a width T of 8.5 mm, for example.

  Since the fastening device using the insert screw according to the present invention is configured as described above, its usage will be described below.

  First, the insert screw 1 is screwed into the screw hole 7 of the first member 5. At this time, the tip of the hexagon wrench is fitted into the hexagonal hole 10c of the flange 10 of the insert screw 1 and rotated to the left, thereby screwing the insert screw 1 into the screw hole 7 to the end.

  Then, the conical portion 10b of the seating surface of the flange 10 of the insert screw 1 and the conical portion 11a of the counterbored hole 11 of the screw hole 7 are joined, so that the center axis C ′ of the screw hole 7 and the insert screw 1 are The insert screw 1 can be screwed into the screw hole 7 with the center axis C coincident and the screw hole 7 and the insert screw 1 being centered (see FIG. 2).

  Thereafter, the second member 8 is placed on the upper surface of the first member 5, and the bolt insertion through hole 9 of the second member 8 is communicated with the female screw 4 of the insert screw 1 of the first member 5. Then, the bolt 6 is screwed into the female screw 4 of the insert screw 1 through the through hole 9 by rotating it to the right. Thereby, as shown in FIG. 2, the 1st member 5 and the 2nd member 8 can be fastened.

  When the bolt 6 is screwed into the female screw 4 of the insert screw 1, the bolt 6 is rotated to the right. However, since the rotation direction is a direction to screw the insert screw 1, the bolt 6 is screwed into the insert screw 1. Thus, the insert screw 1 does not loosen in the screw hole 7.

  Even if the bolt 6 is firmly fastened to the female screw 4 of the insert screw 1, the bolt 6 and the insert screw 1 are formed of a hard material such as steel or stainless steel. Each thread of the female screw 4 of the screw 1 is not deformed. Therefore, even if the first member 5 is a member made of a relatively soft material such as aluminum, the first member 5 and the second member 8 can be securely fastened.

  Further, when it becomes necessary to replace the second member 8 with respect to the first member 5 due to a change in the type of parts, etc., the bolt 6 is detached from the female screw 4 of the insert screw 1 and the above-mentioned The second member 8 is removed, the second member 8 having a different size is joined to the first member 5, and the bolt 6 is again connected to the insert screw 1 of the first member 5 through the bolt insertion through hole 9. The above-mentioned female screw 4 is screwed.

  At this time, the insertion of the bolt 6 into the female screw 4 of the insert screw 1 and the detachment of the bolt 6 from the female screw 4 of the insert screw 1 are repeated. Also in this case, the screw hole 7 and the female screw 4 of the insert screw 1 are centered by fitting the conical portions 10a and 11a of the insert screw 1 and the screw hole 7, and at the same time, the bolt 6 And the female screw 4 of the insert screw 1 are centered, so that deviations of the central axes C, C ′, C ″ are suppressed. Therefore, rattling of the bolt 6 is suppressed and stable. The bolt 6 can be attached and detached.

In addition, since the screw hole 7 of the first member 5 and the center axis C ′, C of the female screw 4 of the insert screw 1 coincide with each other, the bolt 6 is screwed into the female screw 4 of the insert screw 1. Further, the center axis C ″ of the bolt 1 also coincides with the stop axis C ′ of the screw hole 7 and the center axis C of the insert screw 1, and the insert screw 1 and the bolt 6 are centered. With respect to the central axis C ″ of the bolt 6, rattling of the bolt 6 in the inclination direction is suppressed, and the screwed state between the bolt 6 and the insert screw 1 can be stabilized. Therefore, it is possible to prevent deformation of the thread of the bolt 6 and the female screw 4 due to the shakiness of the bolt 6.
Furthermore, even if the bolt 6 is repeatedly attached to and detached from the insert screw 1, the shift of the central axes C, C ′, C ″ can be suppressed, and the reliable fastening state of the members 5 and 8 can be maintained.

  As described above, in the present invention, the insert screw 1 is screwed into the relatively soft first member 5, and the bolt 6 is screwed into the first member 5 through the bolt insertion through hole 9 of the second member 8. The first member 5 and the second member 8 can be firmly fastened.

  Further, a conical counterbored hole 11 having a conical portion 11 a is formed in the screw hole 7 of the first member 5, and the conical portion 10 a of the flange 10 of the insert screw 1 and the conical portion 11 a of the screw hole 7 are joined. As a result, the insert screw 1 and the screw hole 7 of the first member 5 can be centered, whereby the center axis C "of the bolt 6 and the center axis C of the female screw 4 of the insert screw 1 coincide. The first member 5 and the second member 8 can be firmly fastened while suppressing the rattling of the bolt 6.

  Further, since the screw holes 7 of the insert screw 1 and the first member 5 are centered, the central axis C of the insert screw 1 and the bolt 6 can be obtained even if the bolt 6 is repeatedly screwed in and out of the insert screw 1. , C ″ can be suppressed, and the fastening strength of both members can be maintained.

  Further, the conical portion 11a of the screw hole 11 of the first member 5 can be easily processed by the existing submerged milling cutter 12 with a countersunk machine screw.

  The fastening device using the insert screw of the present invention is suitable for fastening the first member and the second member during molding of automobile parts and the like. It can be widely used as a fastening device for fastening members, and even when the second member needs to be repeatedly replaced with respect to the first member, a stable fastening state of both members can be maintained.

1 Insert screw 2 Through hole 3 Male screw (threaded part on the outer peripheral surface)
4 Female thread (threaded part on the inner peripheral surface)
5 First member 6 Bolt 7 Screw hole 8 Second member 9 Bolt insertion through hole 10 Flange 10a Plane portion 10b Conical portion 10c Hexagonal hole 11 Counterbored hole 11a Conical portion 12 Submerged milling cutter 12a for flat head screw Taper drill portion t depth

In order to achieve the above object, the present invention
It consists of a cylindrical member with a through-hole formed in the vertical direction, an insert screw in which the threaded direction is opposite to each other on the outer peripheral surface and the inner peripheral surface, and a bolt that can be screwed into the insert screw. The insert screw has a flange formed on one outer peripheral end, and the flange has a flat surface formed on the head and a tapered surface that extends toward the head on the seating surface. A conical part is formed, the opening angle of the conical part of the seating surface is an opening angle of a flat head screw standard, and a hexagonal wrench can be fitted into the through hole opening on the head side of the flange all SANYO forming the Do hexagonal hole constant depth, the threaded portion of the outer peripheral portion of the insert screw is screwable threaded hole formed therethrough, a first member made of a relatively soft member, the first Screw holes joined to one member A second member made of a hard material having a through hole for inserting a bolt that can communicate is provided, the insert screw is screwed into the screw hole of the first member, and the first member and the second member In the state in which the first member and the second member are joined by screwing the bolt into the screw portion of the inner peripheral portion of the insert screw through the bolt insertion through hole of the second member. A conical portion having the same inclination angle as the inclination angle of the conical portion on the seating surface of the flange is provided at the corresponding position of the flange of the insert screw in the screw hole of the first member. A conical-shaped counterbore hole is formed, and the inclination angle of the conical portion of the counterbore hole of the first member is the same as the inclination angle of the tapered drill portion of the countersunk milling cutter for countersunk screws form Are, the screw hole of the first member by fastening apparatus using the insert screws to symptoms that is obtained by tapping formed in the through hole formed through the milling submerged with the drill having the Tepadoriru portion Composed.

In addition, since the screw holes of the insert screw and the first member are centered, even if the bolt is repeatedly screwed in and out of the insert screw, the displacement of the center axis between the insert screw and the bolt is suppressed, and both members The fastening strength can be maintained.
In addition, since the screw hole 7 of the first member 5 and the center axis C ′, C of the female screw 4 of the insert screw 1 coincide with each other, the bolt 6 is screwed into the female screw 4 of the insert screw 1. Further, the center axis C ″ of the bolt 1 also coincides with the stop axis C ′ of the screw hole 7 and the center axis C of the insert screw 1, and the insert screw 1 and the bolt 6 are centered. With respect to the central axis C ″ of the bolt 6, rattling of the bolt 6 in the inclination direction is suppressed, and the screwed state between the bolt 6 and the insert screw 1 can be stabilized. Therefore, it is possible to prevent deformation of the thread of the bolt 6 and the female screw 4 due to the shakiness of the bolt 6.
Furthermore, even if the bolt 6 is repeatedly attached to and detached from the insert screw 1, the shift of the central axes C, C ′, C ″ can be suppressed, and the reliable fastening state of the members 5 and 8 can be maintained.

Claims (3)

An insert screw comprising a cylindrical member with a through hole formed in the vertical direction, and having threaded portions with opposite threading directions formed on the outer peripheral surface and the inner peripheral surface,
It consists of a bolt that can be screwed into the insert screw,
The insert screw has a flange formed at one outer peripheral end, and the flange has a flat flat surface at the head, and a tapered conical portion extending toward the head on the seating surface. Formed,
The opening angle of the conical portion of the seating surface is formed at an opening angle of a countersunk screw standard,
A fastening device using an insert screw, wherein a hexagonal hole into which a hexagonal wrench can be fitted is formed at a certain depth in the through hole opening on the head side of the flange. A fastening device using the insert screw according to claim 1,
A first member having a threaded hole through which the threaded portion of the outer peripheral portion of the insert screw can be screwed, and a bolt inserting through hole joined to the first member and communicated with the threaded hole are formed. Two members are provided,
In the state where the insert screw is screwed into the screw hole of the first member and the first member and the second member are joined, the bolt is inserted through the bolt insertion through hole of the second member. The first member and the second member are fastened to each other by screwing into a screw portion of an inner peripheral portion of the insert screw,
A conical-shaped counterbore hole having a conical portion matched with the conical portion on the seating surface of the flange is formed at a corresponding position of the flange of the insert screw in the screw hole of the first member. A fastening device using an insert screw characterized by being.   The inclination angle of the conical portion of the counterbore hole of the first member is formed to be the same as the inclination angle of the tapered drill portion of the countersunk milling cutter for countersunk screws. Fastening device using the described insert screw.

Images